I installed the TP holder yesterday in my 295. I put it on the short wall on the left of the bathroom entry. It slightly sticks out, but doesn't impeded entry/exit. The only other location would have taken up elbow room when sitting on the pot.
I found two 1 1/4" stainless screws with plastic anchors in the cabinet, but I'm not sure which fixture they came with or if they were for something else. I had two more 3/4" stainless screws that matched and worked good. As I was screwing in the 1 1/4" long screws, I found out the wall on the other side (which is the storage closet) is only about an inch thick and it started to push out. I stopped before going through and got two more 3/4" screws.
As far as the bar soap holder and the cup/toothbrush holder, I won't be mounting them. (I use liquid soap dispenser and have a free standing toothbush holder)