Adding Boosters

[wireless]

Hello I have just had optic installed.
I have a router/modem in the garage. Technicolor FXA 5000
I have 3 set top boxes hooked up by the Moca connectors.
I also have the main booster hooked up by a Moca connector.
The second booster has no ethernet connections and is free standing.
So I had a set of two "matching" boosters for the main installation.
They are the same wifi, password etc and serial numbers are different. ie 123456-A and 123456-B

I want to expand the network with a couple of more boosters. I have read that you can add 720 boosters and also 5 boosters. 5 sounds right.

I have tried the APP and wound up deleting the free standing booster - B so I did the WPS process and got back the basic installation. .
Done over the air.....no ethernet to the free standing booster.

I bought a few boosters second hand. One pair is same ....wifi name and password wise and the other is different than all others.

I am getting no where to add them. Either with the app or the WPS process.
WPS process on the booster being programmed gets to the blue blinking light then to red.

So when I do the APP process and watch the pics the Technicolor does not have a main output using and ethernet and I assume since it is on Moca..that is the same??

Questions.
Can I use the matching pair to expand?
Is there a clearer process to add the boosters by using the WPS process?
OR??.


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