Is there any reason why frontal stabilizers aren't used on blimps or airships to ease maneuverability in, e.g., gusty winds? Even the indoor blimps have a tail rotor, not the nose rotor for rapid yaw movements.
Also, is there any reason why the "pusher" motors are used instead of puller-ones in the front (with an exception for the Lockheed Martin P-791)?
Frontal surfaces are not stabilizers, they are destabilizers.
Form the pilot's point of view in the forward control cabin, manoeuvering accurately around the mooring point is far easier if corrections make the tail move a little to one side or the other, rather than making the nose, complete with their vantage point and the mooring rope, swing sideways.
Engines at the front just mess up the airflow over the body of the airship, while much of their thrust is dissipated in the mess. At the back they can help re-energise the boundary layer. Propellers also add side area and have a secondary action to stabilize or destabilize in the same way as fixed surfaces.
However most airships are multi-engined, with them installed in pods along the sides. Historically these installations have varied with pushers, tractors or both installed on the one pod. More recently, swivelling ducted fans have become commonplace.