Reverb isn’t normally done by inserting an FX.
Inserts are normally used for things that completely replace the original signal with the processed one, such as as compressors, gates, eqs, dessers etc. This inserts the effected signal directly into the original signal so just raising the fader for the source channel in the target mix will present the fully effected signal.
When you want to blend the original signal with the processed one you would normally use the channel FX send to send the signal to the FX and the corresponding FX return to bring in the effected signal. This is for things such as reverb, chorus, delay etc. So you would raise the faders for both the source channel and FX return channel in the target mix to get the mix of them you require.
I’m not certain on the SQ, but FX sends are generally mono so your channel pan will make no difference. FX returns are stereo though so you can pan/balance as you like on those, but generally they are best set to C to sound natural.