No. level and solid platform is the best choice. If the pool is set up on a slope, the pool will be lopsided and can potentially collapse.
Please watch out the pool’s stability in the early stages of filling pool. When one inch of water is accumulated, if you find that the water is not spreading out evenly, or the pool appears to be bulging to one side, you should stop filling the pool, drain the water, and select a new level site.