Fallout 4 on PS4 has no native vertical offset control in workshop mode. You cannot freely move objects up/down with a button. However, these workarounds exist:
PS4 mods cannot run external scripts (SKSE/F4SE), so true "Place Everywhere" / "Better Workshop" mods don't exist. However, some PS4-compatible mods add:
Bottom Line: On PS4, you're limited to snap points, stacking, and glitches. For true vertical freedom, play on PC with mods.