The best to prove that, is the Print-PreView .
Therefore check BRIM with a very small OffSetFromPart, e.g. 0.05 mm
Is all correct, BRIM follows the outside-conture of the object very exactly. Is there a gap between object and grid (table) BRIM will subvert the object there.
I have made an example, have a look to attachment.

- Stand gerade.jpg (9.89 KiB) Viewed 1684 times

- Stand schief.jpg (5.59 KiB) Viewed 1684 times

- Brim schief.jpg (6.09 KiB) Viewed 1684 times
H.