As you look at the LNB with the ports facing you, the two ports you want are on the left. Actually, the only port that's not usable is the 4th port on the right. That's an input port for connecting an additional "wing" dish. If you mount the Solo Node right at the dish, you'll only need to run one coax into your RV.
I usually check transponder 14 on all 3 sats for signal strength.
There are no "dome" style automatic dishes that work with the Hopper series receivers. The only automatic dish is the Winegard Trav'ler style dishes that mount on the RV roof and have an oval reflector and the same triple LNB as your tripod mounted dish.
I use an Android app from DishPointer.com to find a suitable location for our tripod mounted dish and an under $100 signal meter from eBay to dial it in. I also get the elevation, azimuth, and skew settings from the look up tool on the DishPointer.com website. My typical setup time from pulling out the tripod to seeing a picture on the TV is less than 15 minutes. If I switch from the western arc LNB to an eastern arc LNB, the "Check Disk" routine adds a bit more time.