Aloha,
You need to check State/local laws, including LL/Tenant laws, to determine if the signing method is "legal" for a Rental Agreement.
Beyond that, in my opinion it is just a poor idea overall. In this day and age, everyone in such a rush, it is far too easy to sign electronically and be done with it. In theory, Adults are signing, and should act responsibly by reading what they sign. I can tell you, 95% NEVER read any of it! You will learn this every time you hear "I didn't know I needed to do that".
Have you even met these Tenants? Did they at least show up to see the unit, or was that done via self serve lockbox, or virtually to save more time? Certainly, all of the background checks are supposed to give you insight into the desirability of a prospect, but every bit of paper documentation can be so easily forged these days. You need an in person gut-check.
Also, I sit down with every Adult occupant, and page by page, review the Rental Agreement and other documents with them. I highlight key points of the ancillary, informational documents, such as Lead Based Paint, Mold, and Fair Housing; but then I spend more time and detail with the actual Rental Agreement, confirming terms, late fees, due dates, payment options, and "Tenant Responsibilities" which go far beyond merely paying rent on time. We cover maintenance requests and actual emergencies (and their definition), specific House Rules for particular properties, how best to hang pictures, and yes, our Assistance Animal Policy.
During the walk-through "move in condition" inspection and completion of the move in form for their signatures, I am sure to point out various issues for the Tenant to be aware of to help them save money by NOT breaking or misusing elements, how to clear the food disposer, and anything else unique to the unit.
Typically I spend 30 - 45 minutes on the document signing process, and anywhere from 10 - 30 on the walk through depending on size of the unit.
NOW when a Tenant says "I didn't know", which they still do, but not nearly as often, I remind them of what was discussed during the signing and walk through, which usually gets an "oh yes, I guess I forgot" response.
I 100% believe this is time Well Spent. For 95% of Tenants that I have placed, at move OUT, the units require very little, if any, effort to be rent ready. Easily 90% of SD's are fully or partially returned, across hundreds of units for the past 20+ years.