Orbi AX6000 (RBK853) and Motorola MM1002 Moca Adapter

Hi everyone:

Now that I upgraded to Verizon Fios 1 Gig service, I was very excited to install my new Orbi AX6000 (1 router and 2 satellites) as my first generation Eero's didn't support speeds faster than 125M.  The Orbi clocked in at about 850M with the router hardwired to the Verizon Fios G3100 modem.  Score!

My home is 3 floors and as I only have coax running through the house, the G3100 has to be in the basement where the ONT is.  And therefore that's where the Orbi router (RBR) is to connect via ethernet to the LAN.  I placed the RBS1 on the main floor about halfway across the house, and then the RBS2 on the upper floor on the oppositte side of the house where the basement Orbi is.

Unfortunately, I have a lot of dead spots inbetween. And my 3rd floor office where I put my satellite Orbi provides only about 150-175M.  

So I purchased 2 of the Motorola MM1002 Moca Adapters thinking that would help.

My question:  is there a way to connect the RBS on the main and 2nd floor to the 2 moca adapters (I have coax ports in both of those rooms) so that they get a stronger wired Moca signal versus the wireless from the main Orbi?  I did try to do that by plugging an Ethernet cable from the RBS to the port on the Moca but I don't think this worked.  Plugging a device directly into the Moca directly provides fast speed (~750MBPS), but I am looking to improve my overall "mesh" and signals on the main and upper floors.

I guess Option 2 is to buy 2 more Orbi satellites and shorten the distance between Orbi satellites (although I don't think they are crazy far apart - straight line distance through a floor/ceiling is about 35-45 feet between each).

Option 3 is that I could run an ethernet cable from the G3100 Router LAN across the basement and up to the main floor so I can put the RBR in a main floor which might improve things (and still have the direct 5G router channel for any device in the basement so those don't have to get a signal up from the main level)

Before I go spinning wheels with all of this, I wanted to see if there are any experts who could help weigh in here on the recommended approach or tips?

My current setup is:

ETHERNET: Verizon Fios fiberoptic-> ONT -> ethernet to G3100 Router -> Orbi router. 

COAX: ONT --> 2 way Moca 2.0 coax splitter --> branch 1) G3100 router and branch 2) to TV coax outlets

Thanks in advance for any assistance!