Will two buns use the same litter tray?

Levi and Daisy have a large litter tray in their hutch, at least one is definitely using it, but I still find patches of wee outside the litter tray, is this because two rabbits won't use the same litter tray or just because they haven't fully got the litter tray concept yet?

Both mine use the same trays (occasionally at the same time, or boff one off the loo so they can get in and go!). They have two trays though.

How high are the sides of the tray? Could a bun just be sitting in it and "missing"?

Are they neuted?? if not thts most likely why x

No, it's a large cat litter tray and the spots elsewhere are in totally other areas of the run (they change every day!) I've never had a problem with mine weeing in their 'bedroom' either they both wee in the downstairs area but just all over it! Good to know that they can use the same one, there isn't really room for two trays without the whole bottom bit of their hutch being litter trays!