i3 float runner, see: https://foxypanda.me/making-i3-windows-float-without-for-window/

float-runner.sh

#!/usr/bin/env bash

# Get the command from arguments
arg_str="$*"
$arg_str &
pid="$!"

# Wait for the window to open and grab its window ID
winid=''
while : ; do
    winid="`wmctrl -lp | awk -vpid=$pid '$3==pid {print $1; exit}'`"
    [[ -z "${winid}" ]] || break
done

# Focus the window we found
wmctrl -ia "${winid}"

# Make it float
i3-msg floating enable > /dev/null;

# Move it to the center for good measure
i3-msg move position center > /dev/null;

# Wait for the application to quit
wait "${pid}";