I don't think so.
Unmanned Aircraft Systems (UAS) Frequently Asked Questions/Help
How do I mark my unmanned aircraft with my unique registration number?
If you complete registration using the web-based registration process and satisfy the registration requirements, you may use a permanent marker, label, or engraving, as long as the number remains affixed to the aircraft during routine handling and all operating conditions and is readily accessible and legible upon close visual inspection. The number may also be enclosed in a compartment that is readily accessible, such as a battery compartment.
Now if you have an N number, then I think like a full size A/C, to be on the outside in as large as can be. I know the Inspires & Phantom's I pilot for a company under a 333 are like that. But they were paper registered to get that N number vs an FA number that I got for my own P3S that I registered on-line.