Subwoofer installation help 2021 VW polo

Hi All,

Couple months back my partner purchased a 2021 VW polo (az). I previously installed a subwoofer in her old KA which had an after market headunit in.

Been trying to look for ways to install the subwoofer in the polo but nervous of breaking something on the more expensive car 😂

I've got the wiring kits and in line converter to tap onto the speaker inputs.

Looking for some guidance or diagrams for the best installation location to tap in with the in line converter please - do I go via the speaker cables in the doors or would it be easier to go via the unit in the glove box. If via the gloves box what cables do I tap into.

Had a look across different forums and Facebook groups but there's nothing that's super helpful.

Really appreciate any help or guidance here please.