Question about rotating injection sites?

[ZoomyR6]

hands free syringe loading, draw the plunger back to your dose and hang it and vial on the bottle as shown. I do not inject air to the vial. Thats sand in the bottom of the bottle so that it has some weight to it and won't tip over easily.

Ingenious!
While you are waiting for it to fill, you can go in the shower, get some shopping done, start dinner, eat and by then it should almost be filled to your dose!
I'm just jealous since I don't have the patience to do this but I am still determined to try.