I'd probably line the bottom with parchment paper... I use parchment all the time!
I don't like wax paper at all... the wax always melts into whatever you are cooking...
First time I made my Chili Chocolate Bark... I used wax paper... it was a melted sticky disaster!
only use parchment paper now... and it's great...

and wax paper has a low flash point... which means it can catch fire easily... esp. in a gas oven...
and the wax melts at 50C (122F)...
IMO... waxed paper is only good for wrapping PB&J sandwich lunches for Grade School kids...

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