That's just the opposite, Mick. Leduc idea since the mid 80's... But that's not the point as it's, to me, the best location for the output jack as it works perfectly sitting or standing.
The bad positions are on the side pointing to the ground, at 45 degree or 90 degree.
The Fender output jack on the table is a good one if there's a metal plate holding it.
An excellent position is on the side pointing up à la Ibanez AFR, which is my favourite design ever for a bass. Look at the ergonomics. Yes it's mine. Original one from the early 90's.