Best way to develop different meditation practices (simultaneously or not)
Ideally what you should be doing is a different kind of Ānāpānassati Meditation. What almost everyone will try to do is the "breath mediation” or “mindfulness of breathing”.  Very few of us know that Ānāpānasati is infinitely more deeper than just focusing on one’s breath.

In many suttās it is described as assāsa/passāsa, which conventionally means taking in / putting out of something, and particularly to breathing in / breathing out. My advice to you is to take “So satōva assāsati, satōva passāsati” to mean “He maintains his mind on dhamma (what is beneficial) that should be taken in (kusala or moral) and those that should be gotten rid of (akusala or immoral)”.

“Assa” is same as “āna”, and “passa” is the same as “āpāna”. When  “sati” is added for being mindful of that, it becomes ānāpānassati. So, from now on, what ever that you do, wherever that you go, from the time you wake up, and until the time that you go to bed, try to be selective in taking in “good things” and throwing away “things that are not beneficial”. That is where mindfulness comes in. That cannot be done with breath.

That means basically all the time! One just needs to be mindful of one’s actions, speech, and thoughts, and stop bad ones and cultivates good ones. 

Try to be like a “rukkhamūla”. “rukkha” is “tree” and “mūla” is the “root”; even though the top of a tree sways back and forth with the wind, the tree trunk close to the root is very stable. Thus take “rukkhamūla gatō vā” to mean getting to a stable mindset. Get into a calm and stable mindset that is devoid of greed, hate, and ignorance; keep a modest attitude without any sense of superiority; be forthright and honest, and keep the mind on the main object of cooling down the mind”. That can be done anywhere, a formal seated meditation is not needed, even though that could be helpful.