Brian... I have used both methods meaning where is this going to work for You!
I have a 3000 and have a depth finder and gps mounted on the dash in front of my light switchs. Works for me...
Just hold your garmin in your hand and move it around your dash and see where it fits the best. Yeah I know sounds simple, but what works for someone else might not work for you.
I am sure others will chime in with their opinion too.
Good luck and send us pictures.