Do the Synology ones come in packs? I can only find individuals on sale.
They're sold individually, but I ordered this from Amazon. It's just both units sold together. I use the RT2600ac as my main router, and the MR2200ac as my mesh satellite.
Also, for anyone interested in mesh networking but aren't too knowledgeable or tech savvy, I'd recommend taking a look here:
Mesh Wi-Fi Systems 101: The Best Tips | Dong Knows Tech
It's time to make your Wi-Fi better! Learn all about mesh Wi-Fi systems and find out how to best set up one for your home.
dongknows.com
The author formerly worked for CNET and reviewed routers. I found his articles to be pretty informative. He explains things well, but I think he may use the wrong terms sometimes (which may irk network professionals), but would be easy for non professionals to understand.