Would these work well for setting up a top rope route?

Everybody seems to get all worked up about tri-cams being hard to remove, but I have seen multiple people not know the proper removal technique. When set to cam, all you have to do to remove them is give them a good whack with the nut tool near the top of the rails where the sling connects to the piece. This nearly always dislodges your tri-cam.

They are excellent for setting up a top-rope anchor as long as you have a friend with you to break it down when you're done. You won't want to try to get them out if you've placed them in the camming position. Should be fine if you use them like a regular nut.

If you have to ask you should probably be climbing with somebody who already knows. That said, tri-cams are safe to set set anchors with in the right placements, but I prefer to use other pieces for anchors because tri-cams can get really set in when weighted.

They're gear. You can use them to lead a route to an anchor or set up a toprope anchor. Just make sure you know what you're doing.