I also have wood floors, I use a twin flat mattress protector under my wee wee pads in her "bathroom area" she has a futon in hers and has a play area, also a area for water & food. I HAD to put a top on mine as both mine climb out of the playpen. I also use 3 connected to each other on my porch so they can go out front without getting down the front steps. It is convient for me and safe for them. I tried the wee wee pad frame for mine. Chloe never took it out of the frame but Sissy tore it right out of there. So I guess it depends on each baby. Also Chloe will climb over the backyard fence, Sissy won't but she has a paper fetish that drains me, messy messy, I use a little rake to celan it up, in the playpen or outside the playpen all over the house. A rake cleans it up much faster then having to pick up all the little pieces. Sissy also likes to take her pads, holding onto the end and flying it through the house like a kite, she only does this with fresh ones I put down
PS this set up is 2 playpens tied together with plastic ties and I connected a top the same way with panel I took off another playpen. There is a web address I found later on that sells the panels for a little bit over $6. each