All of my tube mods are direct to battery mods like the one you have purchased. There is no need to be nervous, as long as the center pin of the RDTA 510 connector protrudes past the threaded portion of the connector - as illustrated by the photo already posted by Baditude above.
I have used my tube mods safely for years, and never had a short. The only type of tank I would NOT use on a direct-to-battery mod is any sub-ohm tank with replaceable coils as these often have 510 connectors with self-adjusting center pins that can cause a short.
Of course there is nothing wrong with getting a mod with a standard 510 cap if it makes you more comfortable, and some come with both. Just know that the tank you are getting with your kit is perfectly safe.
Here is a nice kit that includes both types of top cap, from Geekvape:
GeekVape Tsunami Mech Kit W/O Battery - Brass
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