Do you visit islamabad/pindi. Your electricians suggestion is vague at best. The 7th gen already has speakers in the rear shelf. You need to remove the plastic rim over it to get access. Unfortunatly, you can't install 7x10 speakers on there unless you cut the metal. You'll also need to trim the plastic ring which couples itself to the standard 6.5" speakers
If you're electrician is referrering to making a new speaker board for that place, it won't be possible since the rear shelf isn't flat and even still, it'll be a messy job trying to properly secure that board and you'd still have to cut the metal sheet
