All right Ralf,
The parallel option and Burkey Flatliner will work. I have another a bit more smart solution with no need of custom cables, where after connecting 2 Factor pedals you still have 6 isolated sections with both 9 and 12V options and a total of 800mA for the remaining pedals.
Have a look at our brand new CIOKS DC10 power supply which has been designed the Eventide Factor pedals in mind. These pedals need a 9V DC regulated power supply to operate properly. All of them draw a current around 330-360mA. A proper power supply for Eventide Factor pedals should be able to deliver a current of 400mA at stabilized and regulated 9V DC. CIOKS
DC10 power supply provides three such powerful sections and powers three Factor pedals with the included standard Flex cables. If you have a pedal that needs 9, 12 or 16V AC and one Eventide Factor pedal on your board, you should consider CIOKS AC10. It can supply your AC and Factor pedals along with four other 9 or 12V pedals, all in isolated sections.
If you have other questions regarding powering effect pedals, you’re more than welcome to e-mail me directly.