I get my information from someone who have been in the field for over 30 years.

For pythons eggs you need to have a 90F temperature, if room temp is around 70, that mean a delta of 20F.

To achieve that, you need 10-15 Watts for each cubic feet.

Your wine fridge looks like a 3.6 cu. f, isn't it ?

Meaning you should need between 36-54 Watts to heat it.

Knowing that flexwatt is 20 Watts per feet for a 11'' and the 4'' is 8 watts per feet.

if you use a 11'' : 1.8-2.7 feet should do the job. So a 2 feet should be good I think.
If you use a 4'' : 4.5-6.75 feet should do the job. So a 5-6 feet should be good I think.

You can also do a combination of both, there is no problem in that I think.

One last thing : DO NOT USE MORE FLEXWATT THAN NECESSARY. If you go over the 15 watts of flexwatt, it can be DEADLY if you have a malfunction. Using too much of tape will create overshoot, meaning a bigger error margin in temperature fluctuation. And if your thermostat break and just keep heating, you take the risk of COOKING your eggs. While if you have a bit less, the temperature won't sky rock as much. But you also need enough to achieve the desired temperature all the time.