I don't think it's "glue", it's probably double-sided mounting tape. You can go to a body-shop supply place (many times an old-timey auto parts stores will have it too) and get some.
Apply the tape to one side of your emblem(s), trim with an x-acto knife (or appropriate generic equivalent), then C A R E F U L L Y apply each one where it belongs.

CONSIDER THIS - BEFORE you apply the double-stick tape to your emblems, tape a paint-stir stick or other straight-edge to your deck lid as a guide, using it like a shelf (if you tape BELOW the emblems, or tape above and place up to it from below). Place the emblems so that you can see that they EXACTLY go where they were before. THEN, apply the double-stick tape and C A R E F U L L Y place the emblems where they belong.

Remember it would be best to do so when the deck lid is a nice 70-75 degrees (easy for you in Florida).

My 1993 300CE Cabrio has the "old style" emblem that is on piece and attached to the car mechanically (with "speed nuts").

__________________
Jay Yambrovich
Scotts Valley, CA.

1993 300 CE Cabriolet (A124) 131K miles
1997 C-280 133K miles

2000 BMW R1100RT 69K miles
1989 300 E 216K miles (sold)