My view would be that Shell Forecourt is the wrong place for chargers because the facilities aren't suitable for a 30 minute stop.
I would agree, unless the charge time is much lower. If they install 250 Kw chargers then the result looks different. The entire area is setup for quick energy delivery, not slow... And 50 Kwh is too slow.
Use the toilet, pop to the shop - 10-15 min. Anything more than that I now have to entertain myself.
Either make it a car park near something or really fast. There is no real room for inbetween.