I have an AC1750 and would like to install Merlin. The AC1750 (which I got on a clearance) will replace an RT N66U. I will set up a LAN to LAN VPN between the AC1750 and a RT N66U at the other end. Which Merlin version should I use (I cannot see a specific listing for the AC1750 on the site but guess it is similar hardware to the RT N66U)?