How soon will a bonus round land?
Deciding how much to stake on Gates of Hades means accepting that the bonus round does not arrive on a schedule. Nobody can tell in advance how often it will land, and that frequency is not known before the first spin. Whatever RTP version runs here, the result of one session is random. It can finish above your starting balance or well below it.
Before you weigh the RTP options, find out which version this lobby runs. That detail is shown only in the game rules, so open them before you stake real money. Each version carries a different RTP, so the rules are the place to confirm which one applies before you load the game.
Decide how much weight the top prize deserves, because it is a ceiling and not a target. The maximum win of Gates of Hades is x10,000 the bet, which is A$50,000 at the A$5 top bet, and it is reached very rarely. Whether a session comes near it cannot be predicted.