Knowing the limits before the first spin
A 6x5 grid with high volatility leaves the bonus timing open. No one can know in advance how often four or more Zeus Scatter symbols will land in a session. The RTP of 96.49% or 96.50% describes the long run, not the result of your next spin. Every session is random, whatever the RTP.
Gates of Olympus 1000 runs at 96.49% or 96.50%. Only the game rules show which version is in use on this site, so read them before the first spin. The gap between the two is small, but the version in use still sets the long-run return on every bet you place.
A ceiling of x15,000 caps every round of Gates of Olympus 1000, and few rounds reach it. Nobody can predict when a round will get close. Treat the figure as a limit on payouts, not as a result you can plan around.