Adding a few points not already mentioned or considered -

if heal strike is an issue, your target group of rear racks may be limited. The tubus logo (ss: cosmo) gets things far away offering a high and low position. Not aware of another rack that can help with a short chainstay (context is a cyclocross bike?) issue for someone surely with 45+ shoes if a 62cm frame.

Warranty: Tubus has anyone else near ? 25 years, first 3 years with the special support.

Going front racks, while possible, does have some differences. You've got more inertia for moving the handlebar quickly. You lose traction potential when climbing off road. It's harder to pick up the front wheel to clear a curb. But it can steady the bike, maybe there's a drag disadvantage, etc. You will go over the bars easier if that's a risk, and destroy the typical racks with the side/side brace in process.