First time renting a car (I know, shocker!)

I've looked around a lot, and even read the last 30 pages from this thread, trying all the codes. I tried autoslash and carrentals.com

I'll be renting from Tampa (TPA)
10/6 - 10/17
Full Size

From what I've found, the best code for me is for "deloitte" A515100 for $337
But I haven't found anything with anyone saying if they had to prove they were with deloitte or not.

Anyone know any background behind this code? I'm feeling a little gun shy
Or any other thoughts? Advice?

Thanks in advance!