Getting to ground layer in 6 layer board

[angelsix]

If I have a 6 layer board:

L1 ________________Mounting Pads/Low Freq. Signals
L2 ________________Ground
L3 ________________High Freq. Signals
L4 ________________High Freq. Signals
L5 ________________Power
L6 ________________Low Freq. Signals

Whats the best way to join components on the bottom layer to ground?

1. A via form L6 to L2? I micro-via wont go that deep in one go so it would require a load of multiple-via's for every pad.
2. A standard through via from L1 to L6? Takes up a lot of space on all layers
3. Something else?

[robertferanec]

I always use through hole VIAs for power nets (including GND). Only in very rare cases (if there is really no space) I may use uVIA.

[angelsix]

Thanks. I'll do that.