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My controller hardly puts out any heat.
Since yours is a (plug-in) hybrid, instead of a pure EV, you will be using the controller much less than you would otherwise, so that's a good thing. It means less heat, less wear and tear, etc.
I like the idea of mounting things in the trunk because they are all protected that way - no water getting in or anything.
You are in a warmer climate than I am though.
Typically, it is recommended that you mount the controller as close to the motor as you can. If you are using good, thick cable, I don't think that's a real big deal either though.
So here's what you do. Put the controller where you want. If you find that it gets warm, ad a big heat sink/fan to it.
For the battery charger, you want to use an "interlock". You need a 120V relay that will disable turning your car on when power is applied to it. That's another good reason for a main contactor, you can just make the interlock interrupt the power to the main contactor coil. If your car is plugged in, the main contactor will not turn on, and you can't drive your car.
Which controller do you have/are getting? I must have missed that.
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