Seconding everything above, and adding my two cents:
Remember that actors will drop props, and you want to avoid them rolling down onto/into the audience if at all possible. Check with the designers and construction crews for scenery to see about a small lip at the downstage edge, and makes sure the props department knows about the rake. Small adjustments to props can make your life less of a nightmare and the audience safer. Make sure all prop pens have those little clipy pieces of plastic, see if props can get square rather than round glasses, etc.
I did Cat on a Hot Tin Roof on a rake. Brik's crutches on a rake = nightmare, and that actor also couldn't hold onto a tumbler to save his life. Also, the children thought it was cute to "accidentaly" drop marbles from the pockets while on stage. Ugh!