If it's not too late, put a brick inside the bottom of the pot. I have a pot that shape and despite its weight, it was forever being blown over by the wind. Your grass looks lovely.
'Optimism is the faith that leads to achievement' - Helen Keller
Looks great! To stop your decking from rotting underneath the pots, best to raise them by about half an inch - if you can find 4 equal size & shape stones etc., one at each corner would do it.
A trowel in the hand is worth a thousand lost under a bush.
These look lovely! Like others have said put a couple of bricks at the bottom, mine have tall bay bushes in and they still blow over sometimes even with the two bricks. I'm thinking of changing them now I've seen yours
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Found these today at our local garden centre look lovely just swaying in the wind
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.