What type of longterm facility/community takes LO with Suicidal Ideations & Alzheimer’s?

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Dad is 87 diagnosed with mild-moderate Alzheimer’s a year ago and has been taken twice (to two different) Geri-psych units, went willingly with paramedics, for suicide ideations but refuses medication. He even wrote a goodbye letter. He sees no future, no purpose in living, at times. The Geri-psych unit did not prescribe any RX, but if they tried he refused despite my encouraging him to reconsider. He takes no prescription meds ( an antibiotic or muscle relaxer here or there but believes RX mess with your mind) and the psych unit deemed him to have capacity to make decisions, despite that he sign DOOA and HCS to me. He is physically independent and healthy, and is very lucid much of the time, but his judgment is lacking and he is restless & wanders so he had to leave IL and go into secured AL (not needing MC yet). So, not only do I have to find him yet another new place to live, I have to convince him to take drugs, or override him. I would like to hear if an anti-anxiety RX (like Zoloft or Valium?) or an anti-depressant - and which one/type (an SSRI?) worked for your LO’s suicide ideation/depression. My mother also has Alzheimer’s but was and is still on WellButrin long before-hand and 2 mg per day Diazepam/valium was added a year or so after her move to MC to reduce her agitation/irritability. What type of long-term community/facility allows LO with Alzheimer’s and suicidal ideations because Dad’s Brookdale AL is discharging him for suicide ideations (even though they have a Memory Care unit) if he won’t take RX and get stabilized.