I've been eyeing a product called Diamond Piers for an upcoming project. They are small pre-poured footers that you secure by jack-hammering galvanized pipe through into the ground. No dig, no damage, quick install. The pipes get below the frostline, and since they are hollow, inspectors can just run a tape down them to check compliance.
the screen shot of the CAD, shows the plastec foundation pieces, on a standard plastic pallet
mk1 eyball puts the underground distance @ 40"+
which will be below the frost line in the vast majority of locations.
And, yes, its going to be a game changer for instalation, and any possible repairs or service requirements.......much like how Japanese infrastructure is installed in citys, where roads are covered in interlocking bricks, and under that is gravel, and then all the various utility and other systems, upgrades or repairs are done by removing and stacking the bricks, vacuming up the gravel, do the job, put it back together, often at night.
https://www.diamondpiers.com/