My experience is that SLA "guarantees" don't actually guarantee anything.
Your provider might be really generous and rebate a whole month's fees if they have a really, really, really bad month (perhaps they achieved less than 95% uptime, which is a day and half of downtime). It might not even be that much.
How many of them will cover you for the business you lost and/or the reputational damage incurred while their service was down?
But that's not something you get "off the shelf", our lawyers negotiate that. You also don't spend that much effort on small contracts, so there's a floor with most vendors for even considering it.