Hi i need to place one of my my DECO in an horizontally position instead of Vertically as it is supossed to be installed. Will I have some signal issues? thanks

Hello everyone I just bought my Deco e4 pack (2 devices)... and I have a question: I have a current wifi router from my ISP and,... can I add the 2 Deco e4 wirelessly to expand my conection? what I am