The software is 100% safe. Any software that you buy need to be installed. Mental Stop only connects with IB TWS. It does not connect to the internet by itself. Here's a YouTube video demo of it.
/watch?v=cnyJVWegSAY&fmt=18
grantx, to answer your question, it is possible via custom programming to connect the software to CQG. however, IB's quotes will generally be better for this purpose because they use a polling method to update prices. IB takes a snapshot of current market prices every few milliseconds. most other datafeeds update every tick. if there is extremely hight volume and the market is moving fast, IB's quotes is more accurate and will update faster. Data feeds that update every tick will experience bottlenecks during this period.