Nighthawk R7800+7500

[tifan33]

Hi, 

I've got the R7800 rooter and one 7500 to extend my wifi. Two questions :

• is it possible to connect one more 7500 (I've got a big house, 250m², with a big and large wall in the middle) ?
• or is it better, and possible, to connect a mesh wifi 6 satellite 

Best regards