I'll give you a BIG HINT ..... These squirrels while at times numerous are only dumb when there young and naive having zero clue who there enemy's are ? ( Young and dumb )
Earlier in the season and next years survivors etc .. get real smart and very wary and getting shots at them many times is an ordeal of 80+++ yards for months on end.
here is the HINT ... setting up a big obvious canopy your presents is known BIG TIME !!! You will at any other time of year ( Absent of young & dumb ) have a hell of a time getting many up close with realistic AG range shots set up as such.
Sun protection clothing, brimmed hat, compact binoculars and supplies in a small backpack ..... WALKING THE FIELDS and sitting down on a tri-stool w/ backrest and some shooting sticks is FAR & AWAY the most productive way to hunt these critters IMO. Even then you need to move ever 45 min - hour as those within range get spooked.
As one whom has done this for years ... wisdom shared.
Scott S