I’m ready to try installing a transfer switch for AC500

AC500 and 2 B300s batteries.
I’m ready to progess to a transfer switch after using extension power cords everywhere, which has reduced my electric bill to around $0.90 per day. The power company website shows I’m down to using around 3Kwh per day from the grid. I’m set up using PV Priority. I unplugged the AC500 from the grid because it was drawing some power from the house outlet. Now it only gets power from my PV arrays.
.

I’ve tried following the confusing discussions and watched the Reliance videos. Is it really that straightforward, as I saw other people having grounding problems, and needing some kind of special grounding plug?
.

Is the AC500 good to go if I install your Reliance transfer switch exactly as in the video? Is there anything else I need to know first?

@St8kout For the wiring diagram of single-phase AC500, please refer to the following.
The sub-panel in the diagram refers to Reliance home smart panel.