Can you predict when the Free Spins arrive?
You decide the stake for each spin, but nobody can say when the Free Spins will arrive. How often the bonus round comes is not known in advance. One session can hold several bonus rounds or none, and its result stays random whatever the RTP value.
You choose to check the RTP version before the first spin, because that figure appears only in the game rules. Each version is a separate setting, so the same title can pay back differently from one lobby to another. Open the game rules in this lobby to see which version is running.
Picking a bet with the top prize in mind is a choice you make knowingly. The maximum win is a ceiling, and the game reaches it very rarely. Read the figure as the most one bet can pay, never as a result you should expect. Keep each session within a budget you have set in advance.