Curious why you say that. I have mounted them in a variety of places based on convenience and never had an issue. The older Chevrolet vehicles mounted them there originally, but newer vehicles put them in all kinds of places.
Yup. I have mine mounted center inside my firewall. Most current vehicles have them split between the engine compartment and inside the cab. Some era Ford trucks will have them in the passenger footwell, cowl side and some Escapes and Fusions, etc, have them on the passenger side trans hump forward. It's always an adventure these days to initially locate a fuse panel. I've even found some behind glove boxes.