CFD sizing - how much is too much on a single name?

Still getting my feet wet with CFDs after mostly spot forex for years. I understand the leverage is insane, but beyond just not blowing up my account on one trade, how do you all size a position on, say, a stock CFD? Is it simply a percentage of your total trading capital, or do you factor in the daily volatility of the underlying as well? My current playbook feels a bit too conservative, but the thought of having too much exposure on $TSLA or something gives me the jitters.