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Hello mate, I'm using a RADDS 1.5 mainboard in that printer (A lot like the RAMPS 1.4 but for 32bit processors), stock Melzi board should be able to take the BLTouch second board down

But it does share some header pins with the LCD, (the two power pins should not be a problem (as you can solder onto them and power both the BLTouch and LCD but I'm not 100% sure if the Melzi LCD uses the A4(D28) pin but apparently, you can also use RXD1(D10), A1(D25), A2(D26), A3(D27).