The first rule says
One eligible wager per person, only your first placed pre-live correct score wager on the eligible game will count towards this promotion.
Eligible games are Liverpool vs Everton today and Man City vs Arse tomorrow.
Now, it says “one eligible wager per person” which might indicate you could only bet one of them.
However their rules say “the eligible game” and “the” implies a singular event. So when they give two options, that implies two signular events, and you can bet on both.
Looks like a legal loophole that would get your money back when you complained if needed.