Question re: "Complimentary" v. "Competitive" visits.

The articles mention 2 QBs (which makes sense). However, does this also apply to 2 Ts Gs, Cs, RBs, WRs, TEs, DEs, etc.......

In other words, say I bring in 2 CBs for a visit. Will that hurt me with both of them? It doesn't seem like it should after all there are almost always at least 2 CBs on the field.