X-Cart forums - 301 Redirects and Google Tag Manager

Have a couple of questions coming to us from our "marketing" partner and I don't know the answers...

2. Can you please ask how they recommend going about installing Google Tag Manager? This is a small snippet of code that should go immediately after the opening <body> tag. I don't know if there's a module out there, or if they can just drop it on every page on the website.

3. Can you please check how they've handled 301 redirects in the past? We want to be able to tell Google "these pages have moved" so the search engine doesn't haven't to re-index everything.