The GunVault SpeedVault Biometric Handgun Safe has been discontinued by the manufacturer. I'd recommend the GunVault SpeedVault Digital Handgun Safe SV500, which will fit your SR9C, and can be found by using the link below:
https://www.opticsplanet.com/gunvault-speedvault-digital-handgun-safe.html
Interior Dimensions (HxWxD)
8.5" x 2.6" x 5.75"
Here are the interior dimensions (HxWxD) 8.5" x 2.6" x 5.75" to compare with your firearm for compatibility.
We would recommend contacting GunVault at 1-877-453-5077 or use this link to the instruction manual - https://cdn.gunvault.com/wp-content/uploads/2018/05/SPEEDVAULT-MANUAL.pdf
The interior dimensions are (HxWxD)
8.5" x 2.6" x 5.75". The manufacturer does not provide any firearm compatibility information.
Yes, this should accommodate that setup.
This comes as a full kit, but you can purchase another mounting bracket directly from GunVault if you need it.
You would need to reach out to GunVault for additional keys.
Technically yes, but it is recommended that it be mounted vertically.
You can locate the user manual for the product at https://cdn.gunvault.com/wp-content/uploads/2018/05/SPEEDVAULT-MANUAL.pdf.