Hi, yes you can, but your seatpost would have to be extended by at least 11cm (four and a quater inches in old money), because that is the length of the clamp that holds the bike.
However, why would you want to hold the bike by the seatpost? That would put a lot of strain on the seatpost bolt/clamp; not good. Please, don't do it.
Hope this helps, redjohn60.

Yes, you can. However, the width of the clamp means that that I would have to have my seat post fully extended and I would also need to remove a reflector. However, the clamp is well made and I do not think it would damage crossbar paintwork - it certainly hasn't on my bike.

I'd say the stand is ok to use on any bike. The clamp will hold the cross bar or seat post. The seat post is favorite, especially with carbon frames apparently.