Surround speaker placement

[Grimfate126]

Hi. Ive got positions laid out for my front 3 speakers, but the surrounds are tricky. initially,i wanted to put them on side walls, but the wireman came in today, and said that it was impossible to even access the area through the attic. He suggested that we just mount them on the ceiling, above our listening area. Is that ok? ive heard pretty much everywhere that surrounds should be more than 2 feet above ear level, and putting them on the ceiling will amount to more than 6 feet above ear level.

Im using the polk RM10 system, so theyre all satellites.

Thanks.