When refining your carbon inventory, your remote team's fuel and electricity use will be estimated in Scope 1 and Scope 2 and you can refine those estimates with real utility data.
Remote work tends to be a very small portion of overall footprints for most brands that make products. You don't need to collect energy use at your remote employee's homes if the associated emissions are non-material to your total footprint.
If your brand is a service or your product is digital, remote work is likely to be a more significant portion of your total footprint and you should aim to collect Scope 1 and 2 data from your remote employees.
You can collect this data from your remote employees by surveying their utility bills and apportioning a percentage of their total home electricity and fuel use to their remote work based on the square footage of their dedicated home office space.
WFH Utility Data Survey Template (google sheet)