15 tall is the same footprint as a 10. They're tough to find, but will make a difference when it comes to your backfeed water when you shut down the return. Look into a good hang on skimmer, or an external. Your not going to be able to put much inside a 10/15t. The manufactured stands for the corner tanks are terrible. There's no room under them; it's the biggest downfall of a corner tank. Don't mess with external return pumps either; go with an eheim or mag in the sump. You don't have any room to fit a large external, and keep it isolated enough to not leak/stress the sump.
You would have to double check the specs for the footprint but I am 99% sure a sro1000sss skimmer will fit inside a 10 and leave enough room for a baffle, heater, return pump, and a float switch for ATO.