Yes I run my BitAxe on Ocean, you don’t need a node to do that, unless you want to define your own template in case you find a block.
If you want to get started quickly and easily with Ocean, then here are the instructions:
Your Umbrel will allow you to mine with Ocean using your own block template using their DATUM protocol, discussed here:
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Or if you want to solo mine with your own credentials, then @npub1wtgd9ccg76awlp29zl3h466l89wr7hsut0n3ucmtr95h4t29jc6srlsxp2 comes as an option with your Umbrel