Planting roses!! Help

Hi

Can anybody help please. I have just started gardening as it's the first time I have been in a house with just myself and my little boy and now we have our own garden to completely overhaul. 

I have done a lot already but I love roses and have bought and planted five of them. All were bare root and all planted in spring. The first one I planted with the graft below the soil as instructed by my dad 'to prevent suckers' taught to him by his dad, and it is flourishing. The next four I planted a few weeks later with the graft above the soil as instructed by Monty. As it was a bit later they aren't as far along as the first one but two of them don't look as though they are doing anything at all yet. Now I read on the RHS website that a rose should be planted with the graft at soil level and not above as previously believed!!!!

I am so thoroughly confused by the three opposing instructions that I don't know what I'm supposed to be doing now. Is there really a best way or does everyone just have their own opinion? My dad has 9 roses in his garden and they are all beautiful and he rarely gets suckers. Could it be ok to plant the graft below the ground?