Mounting Battery disconnect switch

I need some idea’s on where to mount a battery disconnect switch on my 95 x300. I’m going off the negative side. I using a Fastronix 300A switch from a previous car, great HD switch. Thanks

I just used this, straight onto battery -

Thanks for your input Andy, The reason I’m using this Fastronix 300A is I’ve had it on a shelf & decided to put it to use instead of pulling the neg cable . BTW I do use the trickle charger for short non use periods