Webasto type Air Parking Heater Installation - any good pictures to copy?

Has anyone done a really good Diesel Air Heater installation in a Defender 90 TD5? I've just bought one.
1. Needs a 10cm hole cut in the floor
2. Can be noisy
I've seen on this site one mounted behind the front seats. The preferred place seems to be squeezing alongside the battery under the passengers seat. I don't really want to use up already scarce space in the back, and they don't sound suitable for 'outside' mounting. I can't do the cubby box thing because the kids love having a centre front seat.
Unless anyone says different it sound like the battery box is right …. but would love to have some photos to copy on how it works and where everything is routed.

PS - the kit came with x2 silencers - do I need two?

The kit I bought was this one

If you don't fit an inlet and outlet silencer it sounds like you have a jet engine.

I hate it when I end up parked up in the camper next to ****s who didn't bother fitting the silencers.

OK thanks - always assumed silencers were for gases exiting a pipe, not entering

Be careful not to drill into the chassis, don't ask me how I know

@Jimsky Korsokov
@Bobsticle has just fitted 1 in a series but same idea
Try the link
https://www.landyzone.co.uk/land-rover/cheap-chinese-diesel-heater.337749/#post-4407851