I have always had indoor buns, although now I have 2 outdoor pairs.
I am lucky in as much that Teddi has his own room. Roo & Bonnie always had free range & were only confined to one room at night.
When I start to bunny proof, the first thing I do is to lay on the floor to survey it from their level. It's amazing the things you see, that you don't from higher up.
These are some of the things I have used to help bunny proof a room....
Puppy panels - the ones I have are galvanised 3x2ft & interlink with rods. For a long barrier you can set some at abgles to help stabilise as they are quite weighty.
Baby gate - cover with mesh
Wine boxes are great for wedging between walls & sofas/furniture. They are sturdy, provide a hidey hole & free
There are various methods for containing wires.......
There's the flexible spiral stuff, but it can be expensive.
Mini trunking is great & can be fixed above a skirting board & will hold a number of cables.
Flexible conduit is good too as it is tough, but you do have to remove the plugs off some things to feed the cable in.
I also have a couple of folding fire guards that I use as temporary door barriers
Teddi is a bit hit & miss with his po, so I use childrens bed pads under a blanky on the floor & also baby disposable change mats (although if you have a digger I wouldn't recommend)
Oh & an invaluable trick if you have a nibbler is gaffer tape ...... put a strip on wall corners/painted doors/ top of skirting ... .easy to spot if somebun is nibbling where they shouldn't

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Can't think of anything else at the moment