I could not find the previous discussion about it, but I am sure someone will and post a link to it (them?). The previous discussions show some pictures of different ways to do it.
Basically some installed teflon furniture slides to the bottom of the recliners. You can get them at Home Depot, Lowes, etc.
And some have simply used round plastic water heater drain pans with slight modifications. That works pretty well also. That is what I did.
Edit: I found one
discussion here.