What size tank is it? And is this for a sump right under the tank or a basement sump?
For what it’s worth, after I had a return pump failure several years ago I replaced it with two pumps. I got two DC pumps that could handle about 75% of my normal flow rate alone and I operate them at a little less than full power. That way they were a bit less expensive than two pumps that could handle 100% of my normal flow rate alone, but if one pump fails I can bump the other one up to 100%. Even though I’ll have a bit less flow then normal it will still be plenty for the tank to survive until I can repair or replace the failed pump.
I also went so far as to plug the two pumps into different electrical circuits. So it one GFCI trips or one circuit fails the other pump will keep the tank operational.
When I first did this I started with jebao pumps, but I have since upgraded to Neptune COR 20 pumps.