take out the bottom panel and drill a few small holes in the center, than place a heavy plant there so the center dips a little and put a catch bucket underneath.
thats how i do it
I know the bottom panel comes out so you can get drainage in there, just not sure as our first cage we got we had a heavy plant in the middle and it dipped and then the sides started to leak so we had to seal it around the bottom don't want all them problems again any other suggestions not that yours is a bad one but were not the best at DIY n don't wanna mess it up ??