Hey there, no one seems to have answered your question so I'll pop in. When I bought my first mechanical keyboard and didn't use a wrist rest, I ran it without extending the feet. However, I now use a Grifiti Fat pad and I've found that since my wrist naturally rests on the plane of the board, rather than slightly below it, I prefer to have the keyboard tilted up a bit. A some of the hot rod Korean boards come with a pretty significant slope (14 or so degrees), and I tend to see those paired with wrist rests as well, so keep that in mind. The most important thing is very personal though: you have to be comfortable and not feel like you are straining yourself, so keep experimenting, maybe buy a cheap wrist rest and then play around tweaking your setup.