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IIRC you can solve that using CSS for print media.

The browser will display a different CSS to the printer, so to speak.

Yes, and instead of px or em, you can use mm for css units (positioning, size, etc.).

Use a <tfoot> element (unless you're actually trying to show a sub-total of just the page you're looking at).

Yeah literally need to add an invoice subtotal for the items on that page

I'd be interested in this as well. The industry standard, PrinceXML, has a huge licensing fee (currently $3800 per server), but it's also rock solid, handles modern CSS, and has hooks for adding things like headers and footers for pages and tables.