Loadbalancing - Multiple hostname vs the same origin

I have to activate a load balancer with failover option with primary and fallback pool, where each pool just contains 1 origin (primary and fallback).

I have also more DNS record pointing to the same origin IP address, for example:

Do I need to configure 3 load balancers using the 3 hosts respectively, and in each load balancer use the same origin, but different Health check/Monitor?

Are the still accounted as just 2 origins?

Could you please help me,
thanks

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