Configuring a Route Reflector (Cisco)

Hey, r/networking!

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I am configuring an iBGP topolgy and already have full connectivity.

I am not using a full-mesh topology: https://imgur.com/a/KXHkqqc

and i want to use Hub1 and Hub2 as route reflector (for redundancy).

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I have 2 questions:

1. Not all of the routers are directly connected to the hubs. Is this going to cause a problem? Can i make a route-reflector a client of another route reflector (so Internet 1 can be a RR, but a client of Hub1, same for I2 and Hub2)?
2. Which is the best practical way to achieve the dual RR?

Thanks in advance!