I use the installed pool bulkhead fitting the pool comes with. I then pipe to bottom center of the pool. The return line goes in at an angle at the side to swirl the water moving the solids to the intake.

If you are using the round pool be carefull to not overfill and protect from heavy rains, Once they geet too full the lif drops and nearly 100 gallons surges over the side washing fish out along with it.