The goodness of salespeople is measured on two orthogonal axes. The one that everyone pays attention to is "money brought in". The one that is hard to evaluate is "lies to customers".
"money brought in" is air that your company breathes. "lies to customers" is poison that your company drinks.
Hire sales people 2 at a time. If you hire just 1, they will have an endless list of reasons they aren’t making sales (product doesn’t demo well, not enough marketing, bad leads, etc). sales will always say this, but with more than one, you can tell how real of an impediment to closing deals those actually are