m15 R2, Adding a second ssd, heat concerns?

Should I be worried about the extra heat emitting from a second ssd drive? These laptops aare finicky about heat though it’s usually cpu temps I read about and having to undervolt a little bit.  Also if my unit doesn’t have the ssd screw, where can I source it?  If needed, I can get a second ssd thermal shield from eBay but I don’t have the specs on the screw.  Thanks!