I want to add a second satellite to my RBR50 (AC3000 system)

[ysroq1]

I bought an AC3000 system - router and satellite - but because my house is laid out funny, still have some dead patches.  Which satellites could I buy if were to want to add one that would work with my existing Orbi system? Of the ones that would work, do some work better than others?  Which of the options have ethernet ports on them and how many?  THANKS!

[linkwrt]

For RBR50 kit with RBS50,

you need another RBS50 satellite.

I have 600-750mbps using wireless link between RBS50 and RBR50.

PC connected to lan port of RBS50 satellite.

RBS50 satellite has 4 gigabit lan ports.