1B mechanic question

[bossman72]

Question about the 90 degree positioning when taking calls at first:

Working A and there is a grounder to the right side (first base side) of 2nd base. Since any ball to the right side of 2nd base is less than 90 degrees, would we take any calls in foul territory to comply with the 90 degree requirement, or would we just take a step or two fair and always take everything from fair?

I've heard different theories from different MiLB umpires. What do you think?

Thanks!