if I do something like this, will it work? ethernet cable attached to the modem passes through the wall and arrives in the cellar, I attach deco m4 there (so it stays attached to the modem) from...

I bought this product https://www.amazon.it/dp/B07L44RHC2?psc=1&ref=ppx_yo2ov_dt_b_product_details I need the modem (at home) to transmit wifi to the 3d printer located in the cellar ( Downstairs ) I...