This depends on the application. While it is rare to see personal SRLs mounted to any overhead anchorages of a larger traditional unit, a common exception is when these devices are mounted to order-picking lift trucks. Since the walking-working surface is so small and there is an integrated anchorage overhead, this is a practical solution in that situation.
Either way, always be sure to mount and/or wear these devices in accordance with the manufacturer’s instructions. The manufacturer and any qualified persons at the worksite will always be the best resource for guidance on what is appropriate for your equipment.