This here’s poor rocket science. You only need thrust through the center of mass of a starship. If the nacelles are negligible mass coils (like all the greebles we see in some ship design books) then the center of mass is the aft point between the neck and saucer, which is conveniently where most impulse arrays are in Trek ships. You can also angle that thrust if necessary to be thru-axis, and it won’t cause spin.
More importantly, in Traveller, Thruster M-Drives either move the ship inertialessly or is compensated by grav plating in the ship... grav plating that also negates most if not all structural loads on the starframe. Grav assisted structures are a known quantity in Traveller, to the tune of huge skyscrapers or floating cities. Air/Raft are ubiquitous.
With all that in mind, you can make trekships in Traveller rather easily.