I buy single ply for home and use more of it but that’s the beauty of it. Buying something like Cottonelle is going to be miserable on the pipes at home. You can use more single ply but because it isn’t meant to be used like a paper towel, you can still flush it and trust it to break down appropriately. We have bidets installed on all the toilets too.
Just one? I got a 2 pack for $40. They’ve been installed since March with zero issues. And single ply works just fine at home because I don’t feel like completely wrecking the plumbing in our house built in 1936. If you really have a problem with single ply, might I suggest you re-evaluate how well you’re washing your hands?