Care of shoes that have calf and suede

I recently received a pair of EG Harrowgate in dark oak/ mink suede. In the past, with my other suede shoes, I have put on a protectant ( Kelly's Water Protector) to keep drops of water from damaging or discoloring the shoes. It says it can be used on leather, but I am not sure I trust it with shoes like this. I plan on using Saphir products for the calf part.

How can I protect these shoes?

Thank you!

Todd

Hmmm... Not sure about putting masking tape on them, there are no straight lines on these longwing bluchers. Besides, couldn't masking tape mess up the finish?