Self-capacitance slider

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First of all, I´m sorry if is a stupid question, but I´m starting. I want to manufacture a self-capacitance slider, and I have found in the datasheets that it should be done with 3 channels.


On the other hand, in atmel studio, I can control 8 channels per slider (both mutual and self). 


My questions are:


- How many channels could I have in a slider if I´m going to control it with a SAMD21?? How can I know the maximum number of channels for all the MCUs??, I mean, what features should I look for in each MCU to know the maximun number of channels. (SOFTWARE)


- How many channels per slider should I have?? What considerations should I take into account when deciding how many?? (HARDWARE)


Sorry for my English too.