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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 https://www.antclabs.com/wiring3

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).