I had the same issue I used : Tenda 2.4GHz 6dBi 4 Port Fast Ethernet Router and Repeater | F9
No need to run a cable from router to garage.
All other plugin extenders IMO are a waste of money
Looking for a 2nd hand/used Victron MPPT bluesolar/smartsolar 150/? with ve.direct cable
I'm aware that it's like looking for smokes under lockdown just trying my luck
Price dependant coz will need to finance