If your existing router has a WPS (Wi-Fi Protected Setup) function which most now do, look for a bridge that also has that function. This is what I use for quite a few applications:
https://www.amazon.com/gp/product/B018YPWORE/ref=ppx_yo_dt_b_asin_title_o00__o00_s00?ie=UTF8&th=1
All you do for setup is connect the bridge to a power supply, when it boots up press the WPS button on your router, and then press the WPS button on the bridge. The bridge will then automatically connect with your router (you don't need to search for a network or enter any passwords and you only need to do this step once). At that point, the RJ45 jack on the bridge is functionally the same as a RJ45 jack on your router.... connect any device to it with a cat5 or cat6 cable that would ordinarily need to connect to your router's RJ45 jack and setup your device (SDS200 for example) just as you would if you plugged it in directly to your router.