limit order tutorial. (adding/remove liquidity clarification)

so I've been trading for some time but never needed to know all the various ways to add liquidity or get filled in certain ways.

therefore, I have a couple of questions:

lets assume the current spread is
bid: 19.99, ask 20:00

the posted market price is 19.995

I know I can place a buy-limit order for

17.00
19.98
19.99
19.994

and that these count as adding liquidity.

but what about

19.995
19.997
20.00
20.001

<b>Can I go above the midpoint and have that count as adding liquidity?

Can I match an order from the ask side with a limit order and have that count as adding liquidity?

Can I place a buy-limit order above the ask at all?
</b>

I've done all these things before but I never cared to examine it (if I got filled I got filled)
 
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