Hey, I´m using Iceriver EU Hosting for KS5L and I also recently added two AL3.

There was day or two, when they had some tech issue in their hosting location / data center. But usually everything was back on in less then 24h.
I've never tried to claim any compensation for that. U can have tech issues at your home as well, these things just happens.
Also with the electricity price i have in their hosting location in Dubai ($0.0575 per kwh) and the good performance of the machines, im able to earn more on mining in their hosting than if i was mining at home.
So basically i dont see a blackout for few hours as something for which i need to claim compensation.