Tow it backwards? IMO very risky if the steering wheel is not secured in a perfectly straight line...or what you use breaks...I don't think ANY car is really made to tow backwards.
You have 4 choices...as I see it:
1- Tow 4-down if the owners' manual says so.
2- Tow on a dolly, if it's front wheel drive
3- If it's a RWD car, google "driveshaft disconnect" and go from there.
4- Get a car trailer and put the entire car on that.
or: as I did....research towable cars (4-down) and buy one. My first "toad" was a FWD 1996 Ford Contour....5 spd. stick. Leave the key in the ignition (keeps the steering free), put it in neutral and tow forever.
Current toads are: A 2007 Chevy automatic. Pull one fuse, leave key in, put in neutral and tow forever. The other current toad is a 2011 Ford Ranger 4WD automatic. More involved...had to buy a Ford Only "Transfer Case Disconnect Kit"....400 bucks installed....follow the steps to "activate" it and tow from there.