I'm always going over glass shards with my green guards at 100psi and no punctures over the last few months.
I notice on this company website that the tires for 23C at least come in a replicated pressure range of 105, 115 and 95psi. Wider tires such as 32C come in at a replicated 80psi.
I've never ridden a set, but I'd probably just get a tire with a puncture resistant insert like the marathon green guards.
I wouldn't mind a set for my grocery trailer with 16 inch wheels, but still $60 each is a tough price to justify.