The rule 500' below and 2000' from clouds is primarily an issue of VLOS and safety, It does not have a restriction for above the clouds with the exception you are now no longer in VLOS. If you are on a mountain top which is above the clouds when you launch, and you are maintaining VLOS, then you could fly over the clouds. You then have VLOS, and do not have to go through the clouds eliminating the moisture/condensation issues. As you are on a mountain, at that height, there should not be any air traffic within your VLOS distance around the mountain. But again, you are taking the risk, as their could be a small manned A/C flying where he/she shouldn't. Also, the cloud rule is in the US. If you live elsewhere, you would have to check your local rules. Do you agree 787Steve?
787steve