Oh god...it's been hilarious ever since I learned to hide mines under vehicles & environments.
I'm getting 6-8 mine kills per game +hate mails.
Tips:
1) Abuse downward slopes.
2) Abuse hole on the ground
3) Abuse AT-mines under vehicle trick
4) Some destroyed building wreckage aren't actually solid, so you can place at-mines right through them and no one will see it. One particularly good one is the A-facing entrance for Kharg's C-flag. There's a few wreckage on the ground that you can just place the mine right through them...
5)For some reason you can place an at-mine vertically against the brown long blocks. It'll stick like its c4. For example the bridge between D and B on bandar desert. People will just drive by and boom.
http://battlelog.battlefield.com/bf3/battlereport/show/64955065/4/188837097/ < 4 mine kill
http://battlelog.battlefield.com/bf3/battlereport/show/64957169/4/188837097/ < 6
http://battlelog.battlefield.com/bf3/battlereport/show/64953187/4/188837097/ < 6