I have had 3 x 105's, and fitted an electric, reciprocating type cylindrical pump to each, in the engine bay, on the RHD chassis leg, near the front of the car. First two were Facet Red Tops, the one on my current Ti Super Rep is an old (but best of the best), Mitsuba left over from my rally days.
I always use an inline one-way valve in the line, to prevent drain back, and there has never been an ounce of a problem using these "pull" type pumps in that position.
If you look at an early Porsche 911 on carbs, the (Bendix, same type as Facet), is fitted in the engine bay, almost at the same height as the carburettors.
It has to pull the fuel a long way from the tank mounted low in the nose. If it was good enough for Mr Porsche, then it's ok wth me.
I'd mounted them in the engine bay before on my rally cars, principally because I didn't want them getting bashed underneath. Never had one fail.
It's also much easier to get to under the bonnet if you did have to.
I also have friends fit them in the engine bay with no issues, in particular a hot Triumph Spitfire on twin DCOE's, and one with a TR6 on triple 40's.
I always use a Malpassi Filter King pressure regulator in the line between pump and carbs, mounted high up on the front of the RHD inner wing, to regulate to 3.5psi maximum.
Also a good relay.
Using this system you can disconnect the choke. Once the float chambers are full after a few seconds of the ignition going on, a couple of pumps on the throttle and it starts first time (3/4 pumps in the depths of winter).