Need to really know what it is you are trying to do & install. This is something usually there isnt a generic answer as it depends on the loads of each thing, it's purpose, etc. For example you could tie into the radio fuse, but if the radio & whatever you are going to hook up draw more power then the fuse, you will blow the fuse at a minimum.
A generic answer would be to wire up to the power distribution panel in the driver kick panel, install correct size fuses for each item and relays as necessary.
What is common to do is to run relays directly off the battery and then use the ignition to "turn on" the relay. Do this all the time with Jeep's and aftermarket items so they aren't on all the time but only when the ignition is on.
If all this is unfamiliar I would look through wiring relays at the12volt.com.
As far as the original question, there isn't anything in the engine compartment I would connect to for wiring anything without knowing what it is, it's load, how many "things", purpose, etc.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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