I'd let the auto-level on your jack system just set the coach where it should be. This gives level setting that's the best for your refer and overall comfort.
On our coach with 2 exterior steps, we've found that you can have the first step be too large after leveling. We purchased an aluminum platform step similar to the one you posted just for that reason. You can use them from fully collapsed to fully extended to get a 2" to 6" step.
When you place the step, put it out a little bit from the coach to a natural stepping point. You'll be happier and not miss that first step coming out. With the kids, you'll have to compromise.
We also use our 2 direction level to pre-level on the site. This gets us the best front/back and side/side so it's the easiest to set the jacks (ours are manual). We've learned how much the gradient is on the level, and get it within a reasonable range. Sometimes you win, others you put the step out.
It takes a few extra minutes, its worth the time. We use the best area of the site, and do have to compromise due to our deep slide if there is obstructions.
Also, front/rear will affect your step as much as left/right if you have a door towards the front vs a mid-coach door.