How much medical payment home insurance coverage is right?

The right amount would be Zero,

It doesn't make much sense to pay extra for medical coverage on a home insurance policy when that's already covered under your medical insurance policy.

Ever heard of Double-coverge? It's illegal to get paid for the same loss twice anyway.

Adding Medical coverage on a home insurance policy is generally what we refer to as "Beefing up" a policy. There is almost a zero chance that it would ever be used due to double coverage limitations, but it can entice some less savvy people to purchase the policy.