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UCC24624: Roff related question + layout example for 1layer case

Part Number: UCC24624

Q1) Please kindly share if you have 1 layer case PCB example.
Datasheet show 2 layer example, but my customer will proceed 1layer board.

Q2) https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1021108/ucc24624-roffset-question?tisearch=e2e-sitesearch&keymatch=UCC24624#
Regarding this topics, Datasheet show -35mV = Vthpgd_low voltage
However my explaination was -50mV typ. What is difference come from?
Original my understanding was from -35mV(Vthpgd_low). When the on time reaches 90%, the threshold is toggled to -100 mV (Vthpgd_high) when it does not reach –35 mV (Vthpgd_low).
To control the gate accordingly. Is there only two Vth types, low and high, or do they vary?