Surging Totem automatically replaces Healing Rain, you don’t need to code it separately.
#showtooltip
/cast [mod:shift] Healing Stream Totem; Healing Rain
If you want it to automatically cast Healing Rain/Surging Totem at your cursor
#showtooltip
/cast [mod:shift] Healing Stream Totem; [@cursor] Healing Rain
If you want it to cast at cursor while in combat and show the reticle outside of combat
#showtooltip
/cast [mod:shift] Healing Stream Totem; [combat,@cursor] [] Healing Rain
Also, be aware that keybinds take priority over macro modifiers. So if you want to use shift 1-6 for macros you’ll need to unbind the default shift 1-6 keybinds (Action Page 1-6).
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