Pretty sure those who's job it is to patrol the southern border suggest a combination of a fence wall (so they can see what's approaching) plus cameras and drones.
https://www.washingtontimes.com/news/2018/apr/2/border-patrol-agents-back-trump-wall-survey-finds/
"The
NBPC’s survey, of more than 600 agents in two of the Border Patrol’s busiest sectors, found just the opposite: A stunning
89 percent of line agents say a “wall system in strategic locations is necessary to securing the border.” Just 7 percent disagreed."
I mean it's their 9-5 job. And they want the damn wall. But some virtue signalling sherbro knows better because he's got morals and common sense?
I don't see an issue with the wall.