Best keyboard to use for iPad kiosk?

Hi all, I'm a developer and business analyst on a project building an intake check-in kiosk at homeless shelters in a major city. We are building the check-in app in iOS for iPads and plan to use a tabletop kiosk. Along with that, we need to find a keyboard that is both accessible and usable with iOS. Do you have any recommendations? We probably need to use a USB keyboard, to ensure a continuous connection.

For context, this is the link to the table top kiosk we will be using:

https://www.ipadkiosks.com/collections/ios-kiosks/products/countertop-i…

Thanks so much everyone!