Support RPA BOts 1 FTE per 10 bots

My client is new in RPA support . Currently 1 FTE support 3 Bots. that’s look like resource less loaded with work. Me and my client came to know from different channel that’s per RPA standard 1 FTE supports 10 Bots. I would like to know is that possible and if yes then what foundation services comes in the scopes?