Mobile job quoting and invoicing for an aircon company

Hi Team

New neighbours in our business complex are 2 guys merging their one-man-band companies into a 2 man domestic Air Conditioning company (and aiming to grow working together). Both currently have paper-based systems.

The new company is using Xero for accounting. They are looking to be able to do basic quotes while on site and also invoice from on site when the job is complete. They are trialling GeoOp but I see this has a 3.5 star rating on the Xero Add-on page (https://www.xero.com/nz/add-ons/category/invoicing-jobs/) wherre others have higher feedback ratings.

Can anybody recommend a product they use or have helped a client get up and running?

Cheers