Here is an excellent picture of the placement on the VIIC. It would be outside the conning tower, but some of the plumbing was built next to it, not part of the hinge system (telescope was only used on IX subs.) therefore, you could in theory have a compromise of having much of the snorkel outside the boat, next to the conning tower, at a height roughly where you show in your screenshot.
From that link. Im guessing the vents are not moddled. Speaking of which, is there a possiblility of modifying the 3D model for this snorkel? This could solve some of your problems, ie, make it shorter/smaller.
Quote:
Originally German designers experimented with the idea of dispersing exhaust gases through underwater vents, so as to prevent smoke buildup which could be spotted visually. This idea was later dropped as the visibility of exhaust gases was considered too minute to justify serious development. As such, exhaust gases were simply expelled from small vents at the top of the snorkel head.
Two types of valves were used. The first was a ball float and later in 1945, it was replaced with a ring float. Both functioned in a similar concept. When above sea water, gravity would pull the float down, opening the valve above. When submerged, the positive buoyancy of the float pressed against the valve above, shutting it. When the snorkel was in its stowed position, the valves would open automatically so as to flood the tube.
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Also, a video giving an idea where/how much exhaust/spray occured: