All my enemas are standing, since I only have a shower and a toilet. I used to live where I had a bathtub, but I only did a couple enemas lying down.
I have enjoyed being on all fours, but I can't lie down on our floor, it is cold, it is a slab and I am way up north and right now the temps are 32 outside right now, so even with a towel on the floor, it is cold and that is not pleasurable at all.
I have learned to take a lot of water standing. I enjoy them a lot. Since I have only one choice, I use it.
It would be nice to have a nice place to lay down and take an enema, every time I have tried lying down, as I get really full, moving around to get standing and to the toilet, is difficult at best. I leak some, other times my nozzle comes out, which is not good. So standing, I can get a lot of water in me, enjoy how it flows through me, and when I get so full I can hardly take anymore water, I then lube myself up and enjoy a rock solid penis and masturbate. Then I move to the toilet and have a great rush of water out.