It's not as easy as saying "positive up is always safer". Let's make up a hypothetical situation:
Jimmy Jones has a mech with venting holes on the bottom, he puts his batteries in positive contact up. He carries his mech in his pocket and forgot to use the locking ring, without noticing his mod fires for an extended amount of time, overheating the battery and leading to venting. The pressure and heat deform the battery, blocking off the path to the venting holes located at the bottom.
Remember when in this very thread someone reported a clipped off piece of wire getting between positive post and deck?
So looking at just the battery orientation with regards to safety is the wrong way to look at things, there's more than that at play. The image is right in that damaged wraps can cause a problem, so first and foremost the mech you choose should have either a non conductive inner sleeve (very rare to say the least) or provide enough room to use double wrapped batteries (still check your wraps every time before inserting).
Using a no-dead-short orientation won't prevent battery venting.The venting holes need to be near the positive contact of the battery to be effective.
For faux hybrids my opinion is that in addition to a protruding 510 pin the insulator of the 510 should protrude as well. If your mod puts undue stress on the battery's contact then throw it away - it's not safe to use no matter which orientation your battery is in (the (-) can dent easily as well and there's no telling what that means for the guts of the battery, dented batteries are trash).
Eg the new sandman from atom vapes seems to be one of those mods you don't want to use, it relies on the user not tightening the switch or screwing the atty down all the way.
Many manufacturers put design/looks over safety, the price sadly isn't an indication it was designed with safety in mind either.
Liver test numbers also good.
