Yes, just make sure the SFP module is all the way in the slot and secure and so is the LC cable connectors. Once it is in it should not fall off.
I am assuming you mean the switch is upside down right?
Actually the swtich is installed right side up , but we were not able to establish link integrigty after trying 2 different 3750's and multiple 62.5 fiber cables.
I am relying on remote site help and wanted to rule out installing the sfp the wrong way. The far end device is a 6509 w/6516-GBIC which was not touched. We finally re-installed the original 3548-xl and of course the link came up.
Does it say anything in the logs ? Is it an cisco gbic ? It may not work otherwise. I believe there was a command to bypass the check to see if it was a real cisco gbic .