You stretch the wire which comes in rolls. galvanised is fine or green plastic covered fencing wire. Vine eyes screw into the wall and have a loop on the end thru which you pass the wire and then tie on at the ends. You need an eye per metre or so to support the wire.
An alternative would be to sink tall wooden posts in front of the wall, about 20 to 30cms out and then attach rusty mesh trellis. It's actually wire mesh from a builders' merchant and used for reinforcing concrete but I, and others, use it as trellis for clematis, roses, blackberries etc. https://www.jparrboro.co.uk/mesh-and-fabric-c102x2480254
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Gary, you have 4 good varieties of clematis, different pruning groups but for first couple of years I would treat them all as Group 3, hard prune in February. Next, as stated previous, you need to get them in some large pots or better still in the ground, plant a couple of inches deeper than the nursery pots and keep them well watered. Try a handful of slug pellets round the base of the plants. For growing in pots I use Irish peat based multi purpose compost, it has added nutrients, enough for 12 months, but most important, clematis need lots of water. You can staple some plastic coated wire mesh netting to your fence, remove it in February when you prune the plants if you need to paint the fence. Good luck with the clems.
Iagree with other posters, in that the containers you have them in are too shallow. You can grow clematis in pots if it us deep enough, but remember to water well, though if you gave the room, many are probably better grown in the ground.
I have since moved them into 60 x 60cm pots but since replanting one of them is on its way out. Also one is really struggling since it was first planted, They all have good roots on and we used the suggested compost mix. Is it the weather we are having or am i under watering them? How much water do they need a sprinke twice a day or a good soaking?
Don't always assume that a dead clematis is dead. They have a habit of resurrecting, sometimes years later. I would cut back the dead one but leave the base and roots in the ground just in case - you never know!
Your clematis look as if they are being eaten by vine weevil. There are specific sprays available, you will need to spray or water with them regularly every 6 weeks. They are very difficult to get rid of and are brought into your garden in the compost the plant is growing in. Almost the only way is to remove new plants from their pots when you get them home, wash the root ball thoroughly removing all soil, look for any grubs right up in the middle of the root, squash them, put the plant in a bucket of treatment water overnight before repotting.
Posts
An alternative would be to sink tall wooden posts in front of the wall, about 20 to 30cms out and then attach rusty mesh trellis. It's actually wire mesh from a builders' merchant and used for reinforcing concrete but I, and others, use it as trellis for clematis, roses, blackberries etc. https://www.jparrboro.co.uk/mesh-and-fabric-c102x2480254
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Your clematis look as if they are being eaten by vine weevil. There are specific sprays available, you will need to spray or water with them regularly every 6 weeks. They are very difficult to get rid of and are brought into your garden in the compost the plant is growing in. Almost the only way is to remove new plants from their pots when you get them home, wash the root ball thoroughly removing all soil, look for any grubs right up in the middle of the root, squash them, put the plant in a bucket of treatment water overnight before repotting.
This is a council of perfection!