It only take a few minutes to install Chamspy Pro. Once you have access to target device, follow the instructions on how to install the application. You can check the instruction by logging into your account and click on 'support' button.
Is it possible to monitor two or more phones at a time?
Yes, every spy app has a different pricing and subscription plan. Some allow monitoring for only one phone in one subscription plan whereas some allow you to monitor at least 3 phones at a time. Thus, it basically depends upon the spyware you are buying and will definitely vary from product to product.