Can you scoop/steal a mobile tractor unit

Unless they changed it recently, no, you should not be able to bridge directly into a deadspace area. This thread seems to agree, though it is a few years back. This and this thread seems to agree, and they're more recent.

A good place to check is Singularity, the public test server. Get a friend ( or an alt ), procure a blops/titan/etc. and test it out. Should be simple enough ( remember, everything is ~100 ISK on Singularity ).

According to the Rubicon patch notes a mobile tractor unit cannot be deployed:

• within 40km of a control tower
• within 50km of a gate or station
• within 5000m of another mobile tractor unit

As such it should be possible to deploy multiple mobile tractor units at the same time (assuming sufficient cargo space to carry them + your loot as each tractor unit takes up 100m3)

Edit:

Having been on the test server and checked them out I can confirm that multiple tractor units can definitely be deployed together but, at least on the current test server build, will have a tendency to play tug-of-war with wrecks due to their required minimum separation.