I have claimed off one of these policies in the past. I think it was with insurance4carhire but not 100% sure, as I’ve used a few.
Paid out without question. Just asked for copy of the damage report from the hirecar drop off to substantiate.
I’d been careful to point out every scratch on the bodywork at collection but missed the scratches on the alloys (schoolboy error). Glad I had the policy.
Re the Pedalcover excess policy, yes I think these cover an excess against any policy taken out in your name, up to £500. I also suspect most hire car damage reports exceed that figure.