I am signed up to be a poll worker. I was assigned a precinct near a University with plenty of libs in the area. I work from 6am till 10pm. It will be a long day but no none will get past me with ballot issues.
What is also needed, and doable, is to have Republican poll watchers in every precinct for the last hour and then until voting machines are completely totaled and closed by the election judges. One way of cheating is to have many votes cast for people who did not show up to vote by election judges at the end of the day. This can only happen if there are no actual Republican election judges or poll watchers. Think about why inner city, Dem dominated precincts usually submit their counts late. They are often in areas that are not very safe to enter, even in the daytime.
In 2016 I first thought that Trump had a chance to win when I saw that the Philadelphia area had reported before many more rural western Pennsylvania areas. Those Philadelphia precincts may have had Republican poll watchers which prevented any voting for people who did not actually show up. The RNC must have done a great job with getting poll watchers into Dem dominated precincts.