Need recommendations for outdoor security cameras on triplex

[SaraEllen Hutchison]

I need to install cameras that record good sharp video at each exterior door of my triplex. 

I don't need the system to do anything else, but I do want to be able to monitor it from my phone, 4.5 hours away. So it would be a wifi system.

I have Simplisafe at my residence and like it, but I don't want any door alarms or other bells and whistles. Just the cameras that I can watch!

What do you recommend?