Cpl + router + access point

good evening everyone, here is my installation I have a livebox on which is connected upstream a cpl directly to the outlet, and the second CPL in the garage or it does not capture,

the second CPL has two lan ports, I would like to add a router to it but which is only wired like the mikrotik rb750Gr3 (under openwrt with cake) and add a mikrotik cap lite in 2.4 ghz

is this possible?

to schematize

internet -> cpl and livebox -> cpl garage -> mikrotik rb750 -> cap lite wifi

thank you in advance