Simple.
Build a simple 2 story blockhouse with a three bay metal roof concrete slab carport every half mile.
Bottom floor is garage/shop, upper floor is bunks, shower, and kitchen facilities with heat and AC.
Roof is flat with walls containing shooting stations with built in benchrests.
Small tower from roof contains Day and night-vision video cameras coupled to ordinary computers that have motion detection software running 24-7.
Spacing them every half mile means each blockhouse has a midpoint to the next blockhouse of only 1/4 mile.
Have a “ready” 2 seat 4 wheeler for both left and right of the blockhouse.
Problem areas could have fencing between the blockhouses.
Low traffic areas would not need it.
Staff with BP, ICE, military and State police.
How much would a single blockhouse cost under a contract for 4,000 units?
.
Hell, raffle off slots for “designated sniper” and self-fund for at least a few years.