The only time if makes sense to sign 2 hs Qbs is if at least one is an elite athlete that could potentially play another position. I think most HS QBs realize most schools will only sign 1 QB which is why they notoriously commit early.
UCLA just brought in 3 qbs this cycle and only one will play another position. We will lose three senior qbs after next season. If one can play another position that is fine but we need to take qbs until we hit on one then we can be picky about numbers.