My club used to tie down aircraft to concrete blocks, a practice which ended a few years ago when they moved to the opposite side of the airfield where the aircraft could be parked in a more sheltered location.
I wonder about the utility of screw-in type tie-downs due to the risk of them pulling straight out if the ground isn't (to borrow the maritime term) good holding ground. The other aspect is, of course, that no matter how strong the ground anchor, you are reliant on the anchor points on the aircraft holding.
I hear (and I'm sorry to say that I can't remember where I heard of it) that in South Africa they strap timber posts to the top of the wings. These destroy the lift. Presumably they still have to tie the aircraft down, if only to prevent its brakes being overridden and the aircraft rolling into something.